package com.zhixin.zhixinwaimai.filter;

import com.alibaba.fastjson.JSON;
import com.zhixin.zhixinwaimai.common.BaseContext;
import com.zhixin.zhixinwaimai.common.R;
import com.zhixin.zhixinwaimai.entity.Employee;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.xml.ws.WebFault;
import java.io.IOException;
import java.util.logging.LogRecord;

/**
 * @Description: 检查用户是否已经完成登录
 */
@Slf4j
@WebFilter(filterName = "logincheckfilter",urlPatterns = "/*")
public class logincheckfilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER=new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
       // PATH_MATCHER.match();
        // 1、获取本次请求的URI
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        String requestURI = request.getRequestURI();
        // 定义不需要处理的请求路径
        String[] urls=new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/login",//登录请求
                "/user/sendMsg",//发送验证码请求
                "/front/api/login.js",
                "/doc.html",
                "/webjars/**",
                "/swagger-resources",
                "/v2/api-docs"

        };
        // 2、判断本次请求是否需要处理,----->匹配放行的路径和请求的路径是否匹配
        boolean check = check(urls, requestURI);
        if (check){
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }
        //  4、判断登录状态，如果已登录，则直接放行,查看session是否有存对象判断
        if(request.getSession().getAttribute("employee")!=null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("employee"));
            //获取当前用户id
            Long empId = (Long) request.getSession().getAttribute("employee");
            //设置线程局部变量用户id
            BaseContext.setCurrentId(empId);
            filterChain.doFilter(request,response);
            return;
        }

        //        4-2、判断登录状态，如果已登录，则直接放行
        if (request.getSession().getAttribute("user") != null) {
            log.info("用户已登录，用户id为：{}", request.getSession().getAttribute("user"));

            Long userId= (Long) request.getSession().getAttribute("user");

            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request, response);
            return;
        }

        log.info("{}用户未登录",requestURI);
        //5、如果未登录则返回未登录结果,通过输出流向客户端页面响应数据(因为我们现在不在controller,所以我们返回的输出流，而且得先转成json格式)
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;

    }


    //路径匹配，检查本次请求是否需要放行
    public boolean check(String[] urls,String requestURI){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if(match==true){
                return true;//因为这里要用return结束，所以我们另写个方法
            }
        }
        return  false;
    }
}
